how do you know how many rpms your engine has?

Such as a weedeater.

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lemonie5 years ago

Why does it matter to you?

TSC (author)  lemonie5 years ago
So I can figure out the speed for some thing!
lemonie TSC5 years ago

If you want to use it for something, the speed will be affected by the load you put on it.
The engine might be 11000 RPM unloaded at full throttle, but you're unlikely to get that while it's doing work.

Measure it, with a reflecting tachometer.

TSC (author)  steveastrouk5 years ago
I don't know what a tachometer is!
Like this:
rickharris5 years ago
You may find details on a label. Measuring it with a tachometer as Steve suggests.

Most small weed eater motors are direct drive and will be doing 3000 to 12000 RPM.

i find several references with a Google search.